Measuring device for spectacles and eyeglasses.



J. JAFPE. MEASURING DEVICE FOR SPEGTAGLES AND EYEGLASSES. APPLICATIONFILED JUNE 21. 1910.

993,252. 2 e 4 v Patented May 23,1911.

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"enrrn JACOB JAFFE, OF NEW YORK, N. Y.

MEASURING DEVICE FOR SPECTAOLES AND EYEGLASSES.

Specification of Letters Patent.

Patented May 23, 1911.

Application filed June 21, 1910. Serial No. 568,216.

To all whom it may concern:

Be it known that I, JACOB JAFFE, a citizen of the United States ofAmerica, residing at New York, in the county of New York and State ofNew York, have invented certain new and useful Improvements in MeasuringDevices for Spectacles and Eyeglasses,of which the following is aspecification.

My invention relates to improvements in lens-measuring devices by whichto ascertain the size of lens needed in an eyeglass or spectacle.

The object of my device is to automatically indicate the exact size oflens for a given width of bridge of nose, anddistance between the pupilsof the eyes. I attain this object by the device illustrated in theaccompanying drawing, in which:

Figure 1 is the front view of the entire device; Fig. 1 is the backview; Fig. 2, a cross-section of the device through 2 and 2 in Fig. 1and perpendicular to the bars a and b; Fig. 3, a cross-section through 3and 3 in Fig. 1 and perpendicular to a and b.

With reference to the drawing (t denotes a bar which on both faces isprovided with various scales, in inches or millimeters, or both, namelyscales a a and a Station arily fixed to said bar between the scales aand a is a curved finger d to which a correspondingly curved portion dis pivoted, for the purpose set forth below. Parallel to said bar a is asecond bar I) having also on both faces inch or millimeter scales 72This second bar has fixed to it a recessed projection or plate 6,through which bar a is adapted to slide longitudinally. The end of theplate at which it is fixed to the bar I) is pointed as at c and is in aline with the inner edge e of the plate 6. A piece 0 provided with arecess 0 and formed at its lower end with a pointer c that lies in aline with the inner edge 0 of the piece 0 is slidably arranged on thebar a and in its pointed end 0 has a slit 0 whereby it also engages thesecond bar 6. The opposite end of the piece 0 which projects beyond theouter longitudinal edge of bar a is shaped in conformity with finger 0?,so that both fingers d and c are directed toward one another andconstitute the means for measuring the base of the bridge.

The mode of applying the device for determining the size of lens for agiven base of bridge, and also the distance between the pupils of theeyes is as follows: By placing the device over the nose the slide 0 isshifted along bar a. The distance f indicates then the base of thebridge for the spectacle and can be read OK on scale a Thereupon thedevice is turned around and bar 2') is held over the bridge point of thenose, so that the pointer c coincides with the pupil of the eye towardwhich it projects. Now the slide 6 with the bar I) is shifted along bar64 until pointer c coincides with the pupil of the other eye. Thedistance between the two pointers will then indicate the pupilarydistance which can be read OH on scale 72 of bar 6. The size of the lensis then automatically obtained, the same being the distance between theopposite edges of parts (Z and e on the bar a, which can be read ofl onscale a (in inches or millimeters) or the size of eye can be directlyread off as shown in Fig. 1 Supposing the base of the bridge is unknown,then to determine the lens, it would require to measure the distancebetween the inner ends of the studs of the mounting and the pupilarydistance. To do this the pivoted finger d is turned down, as indicatedby dotted lines in Figs. 1 and 2, and the operation is carried out inthe same way as for measuring the base of the bridge and pupilarydistance in the above described manner. The distance 9 will indicate thedistance between the inner ends of the studs of the mounting and thedistance between the inner edges of parts d and e on the bar a will bethe size of the lens.

I am aware that prior to my invention there have been in use devices tomeasure bases of bridge and the distance between pupils of the eyes. I,therefore, do not claim these; but,

What I do claim is:

1. In the herein described instrument, the combination of two parallelsliding bars, pupil pointers and base indexes, said sliding bars beingso graduated and the said pupil pointers and indexes being so arrangedthat by the adjustment of the pupil pointers for measuring the pupilarydistances and by the adjustment of the base indexes for measuring thebridge distance, the two distances are automatically adjusted on thescales and give the size of the required lens.

2. In the herein described instrument, the combination of two parallelsliding bars, two pupil pointers, of which one is fixed to one of saidbars and freely slides on the other and the other pointer is loose andfreely slides on both of said bars, and base indexes, of which one isfixed to the other sliding bar and the other index is formed on theloosepupil pointer, the sliding bars being so graduated that by theadjustment of the pupil pointers for measuring the pupilary distancesand by the adjustment of the said base indexes for measuring the bridgedistance, the two distances are automatically adjusted on the scales ofthe sliding bars and give the size of the required lens.

3. In the herein described instrument, the

combination of two parallel sliding bars, a

pupil pointer fixed to one of said bars, a loose pupil pointer formedwith a base index, and a second base index fixed to the other slidingbar and formed with a tilting part, to allow of the measurement of thedistance between the inner ends of the studs of the mounting.

In testimony whereof I afiix my signature in presence of two witnesses.

J AGOB JAFFE.

lVitnesses MoRnIs JAFFE, CHARLES H. LEVY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

